[ndsipa_pomu]

If the Jesus miracles happened as described, then it's possible that Judas may have considered Jesus to be unkillable (who can kill a god?) and thus would accept the silver as he could then laugh at the romans' attempts to kill the unkillable - that would certainly explain his regret when Jesus does die for a while. Alternatively, maybe Judas was told to play along with his betrayer role by Jesus as it was part of the divine plan.

There's too many alternative explanations to say that either the miracles were false xor the Judas story was false - I don't see that they're necessarily connected.